#include <iostream>

using namespace std;

int main()
{
    int K, A, B;
    cin >> K >> A >> B;
    if (A == B)
    {
        cout << "NE" << endl;
        return 0;
    }
    int X = 0;
    X = K / (B - A);
    if (K + X * A == X * B)
    {
        cout << X << endl;
    }
    else {cout << "NE" << endl;}
    return 0;
}